Yes, I fully agree with all the above.
But what about where there is a significant and justifiable doubt that the allegation is NOT correct.
And what about when the Magistrates find out that Court time has been wasted, when there was a valid claim by the defendent that the police or CPS withheld evidence (which was proven to be prejudicial by not allowing the defendent to enter an earlier plea which may have differed to the actual plea for trial), but insisted on contiuance of proceedings. I think you will find that most Magistrates take a very, very dim view of the prosecuting authorites, and usually throw out the charge, and award costs (taxpayers money) to the defendent.
Agreed, they will take a dim view if they believe that the crown has been knowingly wasting the time of the court and they would, in those circumstances, award costs. I'm not saying that this doesn't happen but it is not, for example, a daily occurence...
My point is this, whilst the situation you describe does happen it is not common, hence the advice given was that on the balance of probabilities in my opinion (and that of my Dad who has 40 years + experience) it is not worth challenging unless you know with absolute certainty that you are innocent and remember, as has been stated earlier, it doesn't matter how long the light has been red when it was apparently "run" because the amber will have been visible for seconds prior to that...
In the end the OP can, of course, do what he wants BUT he did ask for advice and plenty of that has been given, now he just has to decide which path he should take...
I'd like to think we'd be kept informed...